What I know is that the closer the plant is to its specie [sic] parent, the more its likely to produce keiki. From my experience(which is not much), I've only managed to get keikis from spike from plants that are sick or dying. Its like a last effort for the plant to reproduce before it dies.

Some authorities leave you with the impression that a species (NOT specie, btw) will spike, whereas a hybrid will not. While it's true many hybrids rarely or never spike (at least without some inducement like keiki paste), it's more accurate to say that some species (and hybrids from them) will produce keikis and other species (and *their* hybrids) will not. Most of the hybrids popular are descended from Phal. amabilis, rimestadiana, and aphrodite. None of these species will keiki very readily, and the popular hybrids have (for the most part) inherited that characteristic.

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